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  1. Cloudron Forum
  2. N8N
  3. Could not connect to your MCP server

Could not connect to your MCP server

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  • Z Offline
    Z Offline
    zonzonzon
    wrote on last edited by
    #1

    When running the new version of n8n with the MCP server, it does not work. I have identified some causes. Is it possible to configure this in Cloudron?

    https://community.n8n.io/t/error-could-not-connect-to-your-mcp-server-when-integrating-external-tool-via-sse-in-ai-agent/100957/6

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    • girishG Offline
      girishG Offline
      girish
      Staff
      wrote on last edited by
      #2

      @zonzonzon I read up on this a bit. It seems we have to disable gzip compression for SSE . Can you try this change - https://git.cloudron.io/platform/box/-/commit/51d1efead6438fec879b661237a893d8e65f4a57 ?

      • Edit /etc/nginx/applications/<n8n-appid>/*.conf .
      • search for gzip_proxied any; and add the lines in the commit (careful , don't add the '+' in front of the lines, since it's patch) .
      • systemctl reload nginx
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      • Z Offline
        Z Offline
        zonzonzon
        wrote on last edited by
        #3
        1. search for gzip_proxied any;

        2. Add this location block right after the existing location block in the NGINX configuration file:

        location /mcp {
        gzip off;
        proxy_buffering off;
        proxy_cache off;

        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Forwarded-Host $host;
        
        proxy_pass http://ip:5678;
        

        }

        1. After adding this code, check the NGINX configuration:

        nginx -t

        1. If there are no errors, reload NGINX:

        systemctl reload nginx

        The n8n MCP server has connected and is working properly. Thank you for your guidance. @girish

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        • girishG Offline
          girishG Offline
          girish
          Staff
          wrote on last edited by
          #4

          @zonzonzon are you able to try just the below instead of adding /mcp route ? This is more generic and I hope it works across all routes.

              # compression chunking logic will interfere with SSE packet flushing
              gzip_disable "text/event-stream";
          
              # what responses are proxied
              gzip_proxied no-cache no-store private expired auth;
          
          
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          • BrutalBirdieB BrutalBirdie referenced this topic on
          • Z Offline
            Z Offline
            zonzonzon
            wrote on last edited by zonzonzon
            #5

            @girish I added your code snippet above, and it doesn't work. But when I add a block like mine, it works.

            location /mcp {
                gzip off;
                proxy_buffering off;
                proxy_cache off;
                
                proxy_http_version 1.1;
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $remote_addr;
                proxy_set_header X-Forwarded-Host $host;
                
                proxy_pass http://172.18.20.102:5678;
            }
            
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            4
            • B Offline
              B Offline
              basiliolp
              wrote on last edited by
              #6

              I also tested both solutions, and only yours worked properly.
              Thank you for the help @zonzonzon

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              3
              • girishG Offline
                girishG Offline
                girish
                Staff
                wrote on last edited by
                #7

                The correct fix needs to come from n8n - https://github.com/n8n-io/n8n/issues/14546#issuecomment-2858048370 . I guess if they don't fix it upstream , the package can bundle it's own nginx as a workaround .

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                0
                • Z Offline
                  Z Offline
                  zonzonzon
                  wrote last edited by
                  #8

                  @girish It seems that every time the app restarts, the nginx configuration resets to default, right? Is there any way to keep it fixed so it doesn’t change when the app restarts? Thank you.

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                  • girishG Offline
                    girishG Offline
                    girish
                    Staff
                    wrote last edited by
                    #9

                    @zonzonzon it will be fixed in Cloudron 9 . The intermediate release (8.3.2) didn't have this fix and thus you hit the issue .

                    firmansiF 1 Reply Last reply
                    2
                    • girishG girish

                      @zonzonzon it will be fixed in Cloudron 9 . The intermediate release (8.3.2) didn't have this fix and thus you hit the issue .

                      firmansiF Offline
                      firmansiF Offline
                      firmansi
                      wrote last edited by
                      #10

                      @girish Any ETA for Cloudron 9?

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                      0
                      • E Offline
                        E Offline
                        edwardsalfred
                        wrote last edited by
                        #11

                        Any updates on the Cloudron 9 update?

                        1 Reply Last reply
                        0
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